We currently have SBS 2003. Our company is now over 100 people and we need to think a little bigger.

In my redundancy plan I suggest adding an additional Server 2008 R2 as a secondary domain controller with Exchange 2010 installed in a cluster configuration. So if the DC or Exchange was to go over, it would switch over to our auxiliary server.

Eventually after I have proven everything works great on our auxillary server, I would set that server as the primary server and we would re image the SBS box as our failover box, and that would be secondary domain controller/exchange failover.

My questions are, can I have Exchange 2003 and Exchange 2010 in a cluster formation?

We currently have SBS 2003. Our company is now over 100 people and we need to think a little bigger.

In my redundancy plan I suggest adding an additional Server 2008 R2 as a secondary domain controller with Exchange 2010 installed in a cluster configuration. So if the DC or Exchange was to go over, it would switch over to our auxiliary server.

Eventually after I have proven everything works great on our auxillary server, I would set that server as the primary server and we would re image the SBS box as our failover box, and that would be secondary domain controller/exchange failover.

My questions are, can I have Exchange 2003 and Exchange 2010 in a cluster formation?

SBS has a 75 user limit. Hard stop. SBS has to be the root of your forest. So there are no options for growing while using it. You have to migrate completely to Standard or Enterprise (or DataCenter.)

Also, don't cluster AD as your failover solution. AD has its own failover that is drastically more reliable than a cluster because it uses completely independent machines, not cross dependent machines for reliability. Using clusters in addition to AD's own redundancy is fine, don't use it instead of it.

Currently SBS will be the root. As far as AD servcies, setting a new server as a domain controller should take care of redundancy issues.

What I'm most concerned about is how I will cluster exchange with my current sbs 2003 server. Can I cluster it with 2007? Or do I need to install server 2003 on my new machine and exchange 2003 in cluster.

Scott brings a good point that I missed. SBS is your show stopper. If you follow those links I sent I think you'll see what your options are pretty quickly. Personally as small of an environment as you are(we're only larger by 75 users)I wouldn't spend the time and resources clustering anything. There are many more options for redundancy that are far less troublesome. Scott correct me if I'm wrong but no other DC can exist in an SBS environment correct?

Ahh ok I didn't know that you could have another DC in conjunction with SBS. Never had to deal w/SBS so I wasn't familiar with the config. I've done some googling on the 03/10 cluster - logically it doesn't seem like it would work but I can't read all the results from the searching I've done.

Scott brings a good point that I missed. SBS is your show stopper. If you follow those links I sent I think you'll see what your options are pretty quickly. Personally as small of an environment as you are(we're only larger by 75 users)I wouldn't spend the time and resources clustering anything. There are many more options for redundancy that are far less troublesome. Scott correct me if I'm wrong but no other DC can exist in an SBS environment correct?

There can be another DC but it can't be root and SBS cannot be clustered. Another DC is an option, a cluster would only be an option for the secondary DC, not for the root node itself. But the 75 user limit would remain.

How is SBS a show stopper? Yes, there is a 75 CAL Max. Our average usage is 55 users (many are technicians that only log in for time sheets, etc). So, not a big deal.

You can have other DC w/ SBS but SBS has to be the PDC. So...I don't see how that will affect adding a second server as a dc.

I just need to know how I will cluster exchange. Can I do 2003 and 2010, or do I have to do 2003, and 2007, or can I only do 2003 and 2003?

Plz help!

Average usage? What type of licensing are you on. We were going off of your "100 users and growing" in the OP which takes you way over the 75 user limit if you are on user licensing.

Any cluster, Exchange or otherwise, can only be of a single application. There is no way that you could cluster Exchange 2003 and some other version. This goes for any application, in theory you can have non-clustered failover of apps between versions but not what we call clustering - that turns multiple nodes into a single app presence so being identical is pretty critical.

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